code: def test_train_with_val(self):
      trainer_params = uw3_trainer_params(
          with_validation=True, preload=False
      )
      with tempfile.TemporaryDirectory() as d:
          trainer_params.output_dir = d
          main(trainer_params)
  
imports: import os
  import tempfile
  import unittest
  from tensorflow import keras
  from tfaip import INPUT_PROCESSOR
  from tfaip.util.tfaipargparse import post_init
  from calamari_ocr.ocr.dataset.datareader.file import FileDataParams
  from calamari_ocr.ocr.dataset.imageprocessors.center_normalizer import CenterNormalizerProcessorParams
  from calamari_ocr.ocr.dataset.imageprocessors.scale_to_height_processor import ScaleToHeightProcessorParams
  from calamari_ocr.ocr.training.pipeline_params import CalamariSplitTrainerPipelineParams, CalamariTrainOnlyPipelineParams
  from calamari_ocr.scripts.train import main
  from calamari_ocr.test.calamari_test_scenario import CalamariTestScenario
  from calamari_ocr.utils import glob_all
label_desc: Use image node_id 4 for calling the TestTrainFileNoPreload obj's underlying member method code with example usage: obj.test_train_with_val() without return types